IRON ORE PELLETS

Product Description
Pellets are small balls of iron ore used in the production of steel. They are made with technology that uses the powder that is generated during the ore extraction process, once considered waste.



The pellets are used in the production of steel which is used in the construction of bridges, cars, planes, bicycles, household appliances and much more.
But, before this, the ore goes through a blast furnace that only works when air can circulate freely. For this reason, the material needs to be big enough so that there are spaces between each piece.
On top of this, the ore needs to be strong enough not to be crushed thereby obstructing the blast furnace. Thus, the production of pellets is fundamental to the steel production process.

Mixing is where the properly ground ore is combined with binding agents like Bentonite or organic binders, fluxing agents like limestone or dolomite, and if the ore is a Hematite with coke or anthracite coal as an internal fuel. The mixing is done usually in vertical or horizontal high intensity mixers to achieve a homogenous blend of ore and additives.

From mixing the filter cake is sent to the balling area where the ore is agglomerated on balling discs or balling drums into green(or unfired) pellets. Both drums and discs ball the ore to about 9-16mm size. Drums typically have very high recycle rates so have a screening circuit to screen out undersize and oversize pieces to be put back through the drum. Discs usually do not have a separate screening circuit at the disc.
Green pellets are then transported to the induration process. Pellets that are oversized or undersized and any fines generated during the balling or transporting process are screened right before entering the induration machine and sent back to the mixer or the balling area. The on-size pellets are then fed to the induration machine. Both straight grates and grate kilns dry the pellets out in a drying section, then bring the pellets up to a temperature of about 800-900 °C in a preheat zone, then finish the induration process at roughly 1200-1350 °C. The pellets are then cooled to a suitable temperature for transporting to a load out facility. Both processes recycle the heat from the pellet back through the process to aid in energy efficiency and decrease fuel usage.

Product Type:
IRON ORE PELLETS
Fe (T)

64 %
Si02
1.150 %

Fe0

0.75 Max
Ti02

0.021%

Al2O3

0.319 %

Ca0

1.170 %

P
0.032 %

S
0.031 %
V205
0.004 %
Cu
0.057 %
N2O
1.290 %
Mg0
0.069 %
CCS
309
Size
16-19 mm - 7 %

09-16 mm -91 %

06-09 mm 2 %

Tumbler Index- for above 6.3 mm
96.2 % - 95 % min
Abrasion Index –for 0.5 mm
3.8 % - 4 % max
Sticking Index @950 deg C
20.1 %
Bulk Density
2.17 %
Compression Strength
270 Kg / Pellet / 150 kg / pellet
Fines below 5mm
(-) 5 mm 3 % max
Reducibility index
55-65 %
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